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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22990bd556cd15ad9f7571928878fdb745df476477c5c8902f47447ff3f80cfb' 
  AND token = 'uXZMkbkVLUD7h1UnXN1pj1JYS53Sgum+3QAtr6ziWy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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