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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b17e759239dd537bcb2307438afc8d46a5a20fa2c92ef1ca9b28e44307a6738' 
  AND token = 'RJV4X3CCQr28YlDDCewNGUGby57H/kMyG1H0XYkhCbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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