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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a80744f8dd81bdc3213e53d612d78333cc197116e86ec9bdee873b248940438' 
  AND token = 'h9MPSUO4xyL1JTI0QCFK9cefKqLbkmAK6M2o/WaM28k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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