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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85ea800992a40a3e526a86bccae01aa35c6c27d6fcd06c6d6d9fd05a33353164' 
  AND token = 'tAW8nsaA2h+xZV4Jqe74prRz2c88pYVI6NsR0zrRKAs=' 
  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"
    }
  }
}