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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b1dc12d72d8da750c18d836bb64c89040bd5006e986343f1d704dac5b0ea172' 
  AND token = 'bM9Lmig+g/7MpHrcvY86I1OjsZrWFdi5krkxQfB6nQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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