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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54a0990b0ea8cd88ae6dccca26b2961d224fb2dce65b031241a19bf5440c27d1' 
  AND token = 'juR7pxObyDpQaWG9+QVrbHJPei6TVU2oWdEbK9D6/YA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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