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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d1e86491be26fff7aef2babd7021473dbd3f2585310fed4d7a73b1d937c035d' 
  AND token = '+sm0bod/oAeCWvwcWnfWnD4yt3Y8PEghOT+41BBrv60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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