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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f67e978e6e3032b4017cdaed625e9ce0eedcfd48dde1aef552479c925127c43' 
  AND token = 'QmEfvFJ7eHMI3NNxqLzSu9pXq043XOyW6QFl/1xTEL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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