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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04752013ec5adcda88e89d4be14b389d620ab18cda3c245a1da0cdd6720406f5' 
  AND token = 'o5uOmi84b0y6f+Lo+eC8TpiDZAufVaiacJRWHC9z6SM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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