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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6cf1a870889fa846b225f67ecc176b2ded75438fa4d220037b94fa0d1cde4fa' 
  AND token = '4ngQFWPfT9oK1gZsHiV7H4lgGQRP6wd9lkSwANqvQ9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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