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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d68d7ab4f1c012981132fca070f652ebbabc730c9831da98562672c5a43ce02' 
  AND token = '0dCQqv3x1Ktlgg6QB0gUHcv3nFlUTmuJpk1J62XD3EU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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