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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'd7e4b2e80ae5f608f1e25d8075de69096ca2a774bfb722b0b6b7eb2aa4b3ef91' 
  AND token = 'Z0C7M7U2ehnToX41xz5gwGBb9dIemx9VViZALQZ2M4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00925

JSON explain

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