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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0170b539acc87040630038d6b3991d4c945169cfe5e7266135f61d8da5604cec' 
  AND token = 'YE3Xp53wnvrIO998CdAyGB6wrpgtK1MIvsqPKi75Ubw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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