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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8399fe0526a8b75a40296769e134c52183ab9e2c94eb80ce693a30b8a40017c' 
  AND token = 'eKena/DATLeC2PrXG7UC6/NMC+cEZAyC1r3Or1OYLgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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