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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d38279be6c53cc8a69deed1ae9f53a6c9cdb3a097ca0ddd1730864b205394b1' 
  AND token = 'PorXv7a4bhZivu8wNKSYdz+hsJLzcWeRAWFLKtuX1lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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