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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b53d0822a278e7a01e393f1508618009259387f5483d2f325a78cf3b1dca5e28' 
  AND token = 'RwwSlsyEd/P/KOib0L6KcyJvkaWf5tv5iKvRIrx3qVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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