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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97854de7fd2f2531030dc09f52b1c89c605d676b64058cb3ccc2e618b75a2322' 
  AND token = '8xhQAxn2+Vl95C/6RxGSJ1dfhTbfqqEhJq8sn7ubbbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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