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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c19554e63599d34d8a9caf350a39fcdc8aa28f4b163630d957942c6bf5c01b32' 
  AND token = 'q5TBL2Gd3qgdoh+n1+a2vMkfH8putXaUwcxSUnphFvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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