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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '723f6f50dfb92a435e248b66c459e78051584c3436be304bebcbe3dc54f5921c' 
  AND token = 'KdqvMGXbC4UyBd29aWhiaVOIEhfFkx/wf0MS2c4qSTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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