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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26e2bc2b611057c493bcba8edf59b1ca06941244b4b27f1117d96f9991ee81ec' 
  AND token = '2y2kSzIguPka0p/vN4nWtumssp7ox/5Z+jXsvmGYzMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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