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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6775a2ccfad3914c33f532077715558d849fb510fe83b2506b59cc7517e2b105' 
  AND token = 'lFI8lPrRKOQ3nvDiJbKLWtXpRp+PqB+Mb4IfqRk1QoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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