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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2881b24219f4276a053b32ea3756afa08cf6739b3c32719f2668979575e41942' 
  AND token = 'AjuEbCq9c9HZrUll2DzfjRLTpNNEqownkF8MFLjdtfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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