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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7d68b8ed1fb1489c8878e8e6c6688ec85c344589de0d2d3900cd54fb6d18bc9' 
  AND token = 'RqMOzrN/8DOQ10N1nU42ZnteZq8e3i0sRVpbIyOMrlE=' 
  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"
    }
  }
}