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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08f3bbf7254fb19209168b9198cc4de9d9fccb3fda95ac0295becd11270c3bc4' 
  AND token = 'OmbtmAkeXn3LnvnQtSS+cC53ybpCv3mp20LwSNZlgLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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