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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '150f33454955332b07a67efa24a2aea5612eeb666ad921584a8f86222a02447d' 
  AND token = 'Xj0hho4IpOsPDUWynrnjdF4ofMJ2n2I6Ptw2ECZzl5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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