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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8d55588b7764468b2556a0662c71a6786d15d92772ee0e483c546a1ef8588fc' 
  AND token = 'W3diJ47dVF5wA8Faj+SlYg9AbZDaYBsUdtJWylyDH0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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