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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'd9c6921b7f3b130b56710e6aebae1e1cf5598d2a1abf2e8f6223d5990068e3a5' 
  AND token = 'BixtcfMQmNcNrPAAYaYascO55QGFPB/9GihEjQRsv9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00798

JSON explain

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