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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa3c6137c4bc950635becde1d983524dad3d61123b83cc990f313d6e22faba55' 
  AND token = '0cCKPGoBZ2aY867d6KDj0CMbtzmhA7E8guU08CDlC4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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