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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd18a73eb72e9ffe8a7967c453b5f55f85c9598faa1ee97ed1c86aef2206245bd' 
  AND token = 'Sr+SsN/XpU97BMZN46mrJCyRPU7hYrTOO/Cd4J49OQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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