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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e2cd3ccd4fdf47b642319cdc5ead3f9202126b0e15c303c91544f889f173fa3' 
  AND token = 'YZMGSaK5oEm+THVarXPPQ8ThFp0UPXyW52QNe43fdTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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