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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7bd82df0ebe29ab82ec1fd793248871b00f15bd65b8d9e9e5fd165d8ec7cc44' 
  AND token = '9TgKZdv5MUYofPXoyyPiXQ+MehhtrZr+u93FN4eI0PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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