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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef412088a1dbc52f57656ad2cedd8e245b18c08f069b28ef4033e609c0a1ac1a' 
  AND token = '5tXotMtCUButptE4/1tVGywiRj60IuGOUKnX6/tCqGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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