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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '111a34dfcf20df4c078bae190ab4768b4bc5593b4b9b3cca9a0ebbcd92db2d3c' 
  AND token = 'oYMyTcXu6Ft+jY5+TTkcRGi+XLV+Pzosld7bA7dmjJw=' 
  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"
    }
  }
}