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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60bdbcd28422d4ba28da5b93b1b53ddb2b6722050864c2c8ac99f5c36099dc7b' 
  AND token = 'hi1ETj7qMUCT5P19wqC+cg5cIar8MUMyeztiRNv+4kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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