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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd55f3e76bdef866495723f739d8721b854c7d539cd4574ea168b8d4b8a38be7a' 
  AND token = 'EIEGNFaB4IRTFQ0KJdRUeyPhAwhpArE+0sEmbLFJaC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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