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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6041796c65f7874dc074a41f759013806d6d67c070979c9d6beba9614ff2f86c' 
  AND token = 'PeIqizDS2W+0cAOIAo7XclKGbapmG6Z1dHtG7s/+6jM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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