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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2abc58dc335bd771cc9059ca57b0d1a82c4c4cd95d333e0c9c1eebf9e3d38200' 
  AND token = '7XXjTPIT0W/CFtDVNJkUVIsc7dXRdQMI8PAJG3zcDS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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