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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2860b20ba696a9ba08b47279ad34095a1cb1131cacc486206016b5f20dc2fe9' 
  AND token = '9TYTNcl7xuP1P0BPk/nnEQq+eNO+YdSbkHK6m8JnEQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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