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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '152b8077b587a201ea21b530310827bf50e1b26994e6da1935ef0669269e4029' 
  AND token = 'gIexytLc6vZ1cnVDcKN7W+VhR4CCD4kmlXWKsw2QTig=' 
  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"
    }
  }
}