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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '895fc100fdf7b446d8cc26031b56ec14ba8b47b9ee3104e1d43b8ba0c6e9d52e' 
  AND token = 'hs7QSa/uYWy0UiU4I9W4m70yeJJ7M46QeUU0pC8UydE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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