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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb11e10719203c076921ad70612e576407b3aad8b29e91f1d2148e30204e9adf' 
  AND token = '7hT0AQt/diEeU/yZ0msoubnfayUwj3khP6DG3UCkj/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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