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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '293fb5bf9129a5694488565eeb077218c529e5d4c0eb98ec4bf4c05493e167be' 
  AND token = '9EAXyGBDKhNdpMI1qHOUIoN2gvbP0DHyMgcDInI6b5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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