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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9916fce9540b8f25e316718e13bc41dbe1d0fa66bfb15e36d295e963a7cfeaf0' 
  AND token = 'bSJ//iyt6or48i8H8twz5MyWGXfWqvFW19lF+cnQ+hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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