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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bed0bd8e32a789f564782dc9b825adadf0a17df1f002169b776b41ce1da3dc09' 
  AND token = 'M7EfrK9OxQJAJPAr+2H+88eISkQxRk2kKGDqnvwmsY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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