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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c573d225d920c90af6763eefbb31757540407465fb3a07b8ca34244dd4be15d' 
  AND token = 'NlXPvF0sSydIYoplfR+fC2PJdh14wqhz6K2pp5aE/Yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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