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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c14300ef782ddc009af0928401c747b2717be7fe6033938828f4a6f2858e6a99' 
  AND token = 'b62OUlapRE+28QJQY/KLqoiu2P7x2MTUDfyd9Zc0yJg=' 
  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"
    }
  }
}