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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60e85bcea52818c20a79739a6d37e3ebab6c5fbd021177e1fdb4e894b765bdfa' 
  AND token = '9T2aC9PH96QZb9D7SaMjqbD7/sB0b+IMlQS7ghyCs5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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