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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94f7cb769a12fad57bb6600c1e48d3abfbb53ee0a244f27935d4db223d4ebab7' 
  AND token = '7ZbAYnF5gZr3YvvG+HZs1i+6bFn1dy73+VTq8kyZvWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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