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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e1af4395bb7c0a3856f5ecdc548823ad869ec1aee3b18013e58d3eadc340308' 
  AND token = '1m968wRpwK4++U9mH5dkRZht39hRRT3b8jzv1P8Xgqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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