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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03e1eeb9d04295d032aa92d928b1cd414865c31f7544e17160e9fe440e9ebf4' 
  AND token = 'GPEM7ko/PTKqRVdHJ3wOSE50H5A1F1wXh8cYN+2qSUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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