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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c3d812f234c0abd4178e44515548b218fb685266948bdb35852cd6bf38024e8' 
  AND token = '5z2R3thFsaAfMmHHmaEKV1eEl9Ps+A5B+5BJ3DYUvD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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