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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '26e39507a0b6f1d9f3f519476fba603ef420b4bd15081caab03f7381591411ce' 
  AND token = 'iAV1UKO4cqchpy2TpByMYkNUMOBBomaNVb2+HzG3tYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01508

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}