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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c7f7955705d9da202eaf3385c6352d496086c4ed3fb11f6e492e918dc2c9c0c' 
  AND token = 'RSC4PnlpSZezbzCtaUYD6a5zox+l1U3vNL3sOr02bEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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