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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5154c278a8d7d246abef422922c3d1f8bbf232afebb4a6ec35792583a3fb387b' 
  AND token = 'pRNXlhd9RJalL1ODUGI1/1/v6+U+W3A2+wz3sKRpy8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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