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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a12381b923bee41a481b0a1812a9bc27cc10b9b170869317ad44f3b9d254d45' 
  AND token = 'kn1vnNfzLYsyj4kC9YFJuUMCMSZrJT8FNQQSikcQrys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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