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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c9e98302d0f8edb6903163cb5f30e7955aabd326aaa061040bd49c4e9bd87bf' 
  AND token = 'r/5pokD3h/sSdVFkgS4nh1v6m9d6AiC33PWTV3j3aq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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