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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a07e58f5513da992432e39de7411eb3cd2dc9666b7219432789cd5c42592bfa2' 
  AND token = 'yqin+2Myi/SGXUQfj21fbUo7NqA66rxj1eEHNQHdMzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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