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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fc0707d58aa9e40e3e0f3c9542c5f5cf0de8941f4408253459099d6dda64650' 
  AND token = 'r5HWw5gImI6vMeUR/2QL2nWAvIe8yb1YuN+ijgenv5g=' 
  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"
    }
  }
}