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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ed2e23f662f03bac6ef5314dae83a41fc67a81852ae69bd362e8c1c69c97f63' 
  AND token = 'AoWxHkLjp2RgVNpY7aiEBB7s1b2crsQHSwzjddWL+uE=' 
  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"
    }
  }
}