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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4b0bdcf6a14203f9581ade1b4ddbb2243529e1c924cb8a612b3f99993889b7e' 
  AND token = '/wheRsE8U070rE4VQiFpck50/WAAPZ0cRbS0569Ys9w=' 
  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"
    }
  }
}