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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '825bfc54ef8b3fe848d35601c378ce1d24df10693b543c88d4c9832c0c2fef44' 
  AND token = 'ed+P/Ln6L36jj/97rBs+iD6RqebeMTPP+S2zfHbRimg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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