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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ada48f7ad024f46912c16d21e4d8479c6237b7aafc1f4503904a73d06dd59242' 
  AND token = '/YXLdMlWJ3WYxxam2viOuMHao5psS9ytp30L2mnGj08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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