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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e51de5c1314390bbb122bf1d484194dfad71e9f21a20ac64e90d589572fca1c' 
  AND token = 'lX9DzSZlIZ7VJOmEl9jzpyPPntHxuOGU4Jd8GM6ifXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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