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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27f2ef92ffac3b54616ab323c5b7f845010e0149c3a31540e10ec7414402e849' 
  AND token = '8/oEzlJL/psIlxHhabAptWjiLIG5OV+N0shVM8DYkEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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