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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63c1659c34722e88366aac85021cdb010d5942e9e3862d41aa265aa8d6750884' 
  AND token = 'Vk7p8BBfzXnoTlubsW5dDYj6NCIjyY3qBOIl9e0AKqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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