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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af3db082b2480de87d03e85d5834af98286bb8f1a48f42168c09b1ebc98315f3' 
  AND token = 'axb9BTTkk8nQ6lJ/gssVWuUl2l0BQis904EmgrZpYlA=' 
  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"
    }
  }
}