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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2b50a5bc739e8488b962cfb5a81edf8df49ae1e31bb113eed5ac7c31c0aac4f' 
  AND token = 'qXbKDmq9DD6uf/XrP9qJ/ipy6vH81okPB9w+y0GM1Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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