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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0658a62efe71a1d0050ed757eead3319f64c0ddb69c87d034077e3ae2d463d4' 
  AND token = '5mFk9ZSfo+tStJNNp2NKlGfTVI4VwC8owGoT0SJ+4Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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