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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a3700d63e7fe6a65139cc5f3be21c07d7510b620b5d22753b2a81b0fcf21115' 
  AND token = '3uocRE9cHfskbB8pu+G0Gqt5TdjOdqVxItjSibTVgqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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