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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '704de3da1f5c624913b5570ecf6f50f856deb631389aef66f28dc63d575c52b8' 
  AND token = 'uX4y3hXggAg5WwHYrTU8atHF5m+7T38P+1v09uJoHoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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